Office



(N0 ModeL) Sheets-Sheet 1.-

. M. MARTIN.

FLOUR BO LTING MACHINE.

No. 315,308. Patented Apr. 7, 1885.

WITNESSES INVELITOR ATTORNEYS.

N. PETER s. Phnln-Liihcgnphcr. wmin mn. D. C.

(No ModeL) 2 Sheets-Sheet 2.

M. MARTIN.

FLOUR BOLTING MACHINE.

No. 315,308. Patented Apr. '7 1885.

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WITNESSES INVENTOR Mg v/w ATTORNEYS N. PETERS. PhnloLimc m bn. washingtam D. c.

STATES l PATENT omenf MORITZ MARTIN, or BITTERFELD, rRUssIaeERMAnY] rFLOUR-BOLTING MACHIINE,

SPECIFICATION forming part of Letters Patent No. 315,3O 8, dated April7, 1885.

Application filed October: 29, 188-1. (No model.) 7

' zontal bolting-machines; second, economy of power, as the meal to bebolted has not to be lifted and as the bolting-reel does not require tobe rotated; third, a better bolting, as a more uniform distribution ofthe material to be bolted is produced on the bolting-surface; fourth,

. greater durability of the bolting-cloth, as with a better distributionof the meal the cloth is acted upon in a more uniform manner and as thedisadvantageous crowding of the meal cannot take place as easily as inhorizontal bolting-machines; fifth, a simpler and consequently cheaperconstruction. Practical tests, however, have shown that the verticalbolting-ma chines possess besides the advantages mentioned a number ofdisadvantages, so that hitherto in practice the horizontalboltingmachines have been preferred.

It formed one of the objections to vertical flour-bolting machines thatwithout absolute uniformity in the revolutionsa partial closing of themeshes of the bolting-cloth and consequently unequalbolting took place.When the speed of the machine slackened, the bolting action ceasedentirely, as by the gradually diminishing centrifugal force the meal wasnot thrown with sufficient force against the bolting-cloth, so that itdropped without being bolted, even when the revolving cylinder or drumis provided with shelves, in which case the meal is dropped from shelfto shelf without being properly exposed to the bolting action. With atoo rapid movement of the drum or cylinder the air in the reel-chest wascompressed by the gradual introduction of new quantities of air to sucha degree that the fine particles of flour were prevented from passingfreely through the bolting-reel. The horizontal bolting-machines are notso easily affected by differencesfof speed, as with. the

l slower motion the meal is collected in heavier layers at the lowerpart of the bolting-reel, so that a more effective bolting takesplaee,while at higher speed the air-pressure in the reelchest is easilyovercome, because the chest is v generally made of considerable size andbeovercome by the weight of the material that is forced against thebolting-cloth.

the disadvantages of the vertical bolting-ma tion in which theair-pressure is uniformly distributed withinthe machine, and in whichbefore the meal passes into the bolting-reel proper.

sponding parts; i

A in the drawings represents the reel-chest,

' chines and to furnish an improved construel Similar letters ofreference indicate correl cause the increased air-pressure is moreeasily The object of this invention is to overcome the bolting operationis facilitated by a preparatory bolting operation, which takes placewhich is composed of horizontal top and bot tom rings, a a, which arerigidly connected with each other by hollow vertical pillars b b. Thetop ring, a, is closed by a cover, 0, and the bottom ring, a; by abottom, 0', which latter is provided with openings for the chanterialfrom the interior of the reel-chest to the outside. Between the uprightpillars b, which are made of rectangular cross-section, are arered withwidely-meshed felt or flannel.

The central driving-shaft, f, of the machine is supported in theusuahmanner by a step is supported on a piece of cross-timber, C, whilethe neck-bearing is supported on the coverc.

To the shaft f are attached the following parts, which partake of therotation of the same: At the upper end the driving-pulley g, and belowthe same at the inside of the nels that convey the bolted andunbolted'ma ranged detachable sections or doors I), that l are made ofwooden frames, which are covand neck bearing, of which the step-bearingIOO . --.7o. In the accompanying drawings, Fig-urei l reel-chest, therevolving drum B of the prebeaters 0 and horizontal shelves p that arecomposed of ring-segments, which are secured to the conical shell nofthe revolving drum D.

Below the drum D of the main boltingreel D the shaft f carries ahorizontal scraper, q, .hat moves along the bottom of the uppermostreceiving-pan, f. Below the pan f a second scraper, 7, moves the mealthat has not passed through the bolting-reel along the bottom of anintermediate receiving pan, 7, while a third scraper, 1", below the panf, moves the sifted flour along the bottom of the reel-chest. The pansff f are arranged concentrically with and Vertically one below another,and are provided with openings in the center, through which the shaft fis passed. The pans are connected with each other by angle-irons s, andwith the bottom ring,a, of the reel-chest by inclinedangle-irons t. Thereceiving-pansff f are made of cast-iron or wrought-iron with zinc rimsand wooden bottoms. The upper and intermediate pans,ff ,communicate bychannels u u with vertical trunks v 12, through which the bran and mealwhich are collected by the scrapers qandr are conveyed off. The siftedflour is conducted off at the opposite side of the bottom of the machineby two trunks, o 12 which communicate with openings in the bottom of thereel-chest.

To the inner surface of a fixed ring, w, at the under side of the cover0, is secured the bolting-cylinder B of the preparatory bolt B, whichcylinder is made of perforated-or slotted sheet metal. The perforatedcylinder is also made in the shape of a truncated cone, in the samemanner as the revolving drum B of the preparatory bolt B. The lower endof the perforated sheet-metal cylinder B is bent inwardly and riveted toan angular-iron stiffening-ring, w The outer surface of the fixed ring wis provided with a circumferential groove in which the bolting-cloth ofthe main reel D is retained by a steel band, 20, which is tightlyapplied around the ring w. The lower end of the boltingcloth is appliedby a metal ring, w", to a cylindrical extension of the intermediatereceiving-pan, the outer surface of which extension is carefully turnedoff. The ring w is also grooved, and the bolting-cloth attached to thegroove by a steel band in the same manner as at the upper end.

To properly stretch the bolting-cloth, so that it assumes the form of atruncated cone concentric to the revolving drum D, the lower ring, 10 isprovided with cars a, through which and similar ears, 2 z, of theextension of the receiving-pans f 2 are passed a number of screw-bolts,by means of which the ring to can be adjusted, so that the boltingclothmay be more or less tightly stretched. It forms, therefore, a fixedboltingreel, which comes into action when the preparatory bolt B hasperformed its function of collecting the meal to be bolted andconducting it to the main bolting-reel. As the upper part of thebolting-cloth is not called into action, it may be made of linen insteadof silk cloth.

The truncated form of the preparatory bolt and main bolting-reel hasforits object to prevent the too quick dropping of the meal and thecrowding of the same in the bolting-reels when the machine runs atslower speed, This is an essential feature, as thereby the regularworking of the bolting-machine is secured even with variations of speed.

The air that assists in the bolting operation is introduced through anopening, a, of the cover 0, and an opening, a", in the top disk, h, ofthe preparatory bolt, and conducted through the latter and the mainbolting-reel to the lower part of the reel-chest. The air in thepreparatory bolt and the main bolting- -reel is taken up by the beatersand assists in the bolting process. The air which is continually drawninto the machine would soon be compressed in the lower part of thereel-chest if no egress were provided for the same, and it would therebyhave a tendency to retard instead of assist the bolting operation. Thetoo great accumulation and pressure of the air are partly prevented bytheconstruction of the doors or sections of the reel-chest, which aremade of loosely-meshed fabric through which some of the air can pass offto the outside; but as the covering fabric retains the particles offlour carried along by the air, said particles close up in course oftime the meshes of the fabric and cannot be entirely removed therefromeven by heating or shaking the frame, especially when flour from wetgrain is bolted. It is therefore necessary to furnish other means ofeduction for the compressed air, for which purpose the hollow pillars b'b are used and provided at their lower ends with openings b throughwhich the air passes in upward direction in the pillars, whereby auniform expansion and distribution of the air takes place, so that theini urious pressure of the same is avoided. As, however, the air in thereel-chests is always impregnated with particles of flour, which isespecially the case when larger quantities of air are drawn in, whichhas to be regulated for quicker or slower bolting by regulating the sizeof the induction-opening a, it is unavoidable that some of the particlesof flour are carried along through the pillars b. To prevent this asmuch as possible, the pillars b are provided at their highest pointswith valves 1), which are composed of small pieces of flannel in asuitable frame that are pivoted in such a manner that they open likeflapvalves to a greater or less degree toward the air-induction openinga according as the pressure of air is greater or smaller, the saidvalves being weighted so that they normally rest against the stops I),being opened by the pressure of the air passing up through the pillars,and presenting an inclined surface against which the flour particlesimpinge and fall back into the channel, being collected and again passedthrough the bolting-reels. The air which escapes through theseregulating valves 1) is conducted to the preparatory bolt B,where itmingles with the air drawn in from the outside. This carrying along ofthe flour particles with the air takes place only with a strong andquick bolting, and then to the extent of a very small percentage only.This rebolting of the flour particles carried along forms but a smalldisadvantage, as the main desideratum-namely, the compression of the airin the reel-chest is prevented and regulated, wherebya very effectiveworking of the Vertical bolting-machine is obtained.

Havingthus described my invention. I claim as new and desire to secureby Letters Patent- 1. The combination, in a flour-dressing machine, of avertical main cylinder in the form of a truncated cone, a rotary mainboltingreel within said cylinder, a preparatory bolting-cylinderconcentric to the mainboltingcylinder above said main bolting-reel, anda preparatory rotary bolting-reel withinv said preparatorybolting-cylinder, substantially as described.

2. The combination, ina flour-dressing machine, of a vertical mainbolting-cylinder in 3 5 the form of a truncated cone, a rotary conicalmain bolting-reel within said cylinder provided with vertical beatersand circumferential shelves, a preparatory vertical conicalboltingcylinder concentric to the main bolting-cylin 4o paratorybolting-reel, and vertical and in- 55' clined channels connecting thelower part of said main bolting-cylinder with the upper part of saidpreparatory bolting-cylinder, substantially as described.

In testimony that I claim the foregoing as 60 my invention I have signedmy name in presence of two subscribing witnesses.

' MORITZ MARTIN.

Witnesses:

EDUARD PAJEMANN, Orro GENSOHEL.

